Hi,
got a Dell Optiplex 9010 i5 here, with ancient HP KB-0133 PS/2 keyboard:
Linux [HOSTNAME] 3.8.0-34-generic #49~precise1-Ubuntu SMP Wed Nov 13 18:05:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
which incidentally I'm always suspending to RAM (which may e.g. cause
some quirky I/O register values).
After an uptime of 47 days (equalling perhaps 40 suspends)
it just happened that after some quite possibly frantic (mis-directed)
typing activity in X.Org
keyboard processing locked up, full stop
(with Caps Lock LED accidentally activated, BTW).
Caps Lock was NOT intentional (IOW, pretty much activated right the moment
that it locked up),
so it might be that special (i.e., somewhat non-hotpath)
keyboard mode kernel handling caused IRQ-related things to go haywire
(please also note that this is quad-core SMP).
Symptoms were that i8042 IRQ was NOT incrementing any more,
yet with USB-based mouse still working,
and with i8042 IRQ counts very similar to the current post-lockup status:
# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 15 0 0 0 IR-IO-APIC-edge timer
1: 3731516 1 2 1 IR-IO-APIC-edge i8042
4: 2 0 0 0 IR-IO-APIC-edge
8: 0 0 0 1 IR-IO-APIC-edge rtc0
9: 44 0 0 0 IR-IO-APIC-fasteoi acpi
16: 848 51 46 6 IR-IO-APIC-fasteoi ehci_hcd:usb1
23: 1030 21 28 27 IR-IO-APIC-fasteoi ehci_hcd:usb2
40: 0 0 0 0 DMAR_MSI-edge dmar0
41: 0 0 0 0 DMAR_MSI-edge dmar1
42: 4706685 4 19241 1 IR-PCI-MSI-edge xhci_hcd
43: 26 0 0 0 IR-PCI-MSI-edge mei
44: 11758582 1031 737 407 IR-PCI-MSI-edge ahci
45: 8634 0 0 0 IR-PCI-MSI-edge eth0
46: 16395534 1172456 434192 3091691 IR-PCI-MSI-edge i915
47: 149 0 0 0 IR-PCI-MSI-edge snd_hda_intel
NMI: 4358 191563 192436 199591 Non-maskable interrupts
LOC: 54195238 49071989 50750421 51893922 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 4358 191563 192436 199591 Performance monitoring interrupts
IWI: 0 0 0 0 IRQ work interrupts
RTR: 0 0 0 0 APIC ICR read retries
RES: 24539990 11668206 5062037 4591010 Rescheduling interrupts
CAL: 306 729 671 649 Function call interrupts
TLB: 3450457 3374213 3213836 3361641 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 2957 2942 2942 2942 Machine check polls
Manual pm-suspend via ssh remote login then MANAGED TO FIX IT!
(please also note that Caps Lock stayed lit while suspended,
and then got switched off soon - BIOS-initiated? - during resuming!!)
According to https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/23497
a simple unbind/rebind of i8042 instead of a full pm-suspend
might possibly have helped, too (will do further experimentation next time).
Useful ways for more detailed investigation on semi-running system?
(i8042 register dump, etc.)
Will try to have some more "mis-directed frantic typing" joy, perhaps it's
reproducable.
Not demanding much useful discussion given this non-current and non-mainline
kernel version - mainly submitting this as a "data item"
for other people to research and possibly extend
(and not even sure whether this is a kernel issue,
or rather a hardware mishap instead).
keywords: kernel i8042 apic irq lockup keyboard optiplex dell
Thanks,
Andreas Mohr
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